Causative Have – Examples in Different Forms

The right word order is crucial here: have something done.

The following examples demonstrate how you should use the structure in various forms:
• John has his eyes tested every year. (Present Simple)
• John is having his eyes tested now. (Present Continuous)
• John has had his eyes tested recently. (Present Perfect)
• John had his eyes tested yesterday. (Past Simple)
• John will have his eyes tested tomorrow. (Future Simple)
• John is going to have his eyes tested soon. (be going to)
• He should have his eyes tested. (modal verb)